Comparison of antibody reactivities to plate-bound antigens detected by FLISA with antigens on live cells by FACS. (A) Antibody detection by FLISA in 4-patient samples against plate-bound membrane antigens from the AML cell line (Kasumi-1). (B) Antibody reactivities of the same patient samples against live cells (Kasumi-1) detected by FACS. APC, allophycocyanin; FACS, fluorescence-activated cell sorter; MFI, mean fluorescence intensity.